2 * This file is part of UBIFS.
4 * Copyright (C) 2006-2008 Nokia Corporation.
6 * SPDX-License-Identifier: GPL-2.0+
8 * Authors: Artem Bityutskiy (Битюцкий Артём)
13 * This file implements UBIFS initialization and VFS superblock operations. Some
14 * initialization stuff which is rather large and complex is placed at
15 * corresponding subsystems, but most of it is here.
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/module.h>
22 #include <linux/ctype.h>
23 #include <linux/kthread.h>
24 #include <linux/parser.h>
25 #include <linux/seq_file.h>
26 #include <linux/mount.h>
27 #include <linux/math64.h>
28 #include <linux/writeback.h>
34 #include <linux/bug.h>
35 #include <linux/log2.h>
36 #include <linux/stat.h>
37 #include <linux/err.h>
39 #include <ubi_uboot.h>
40 #include <mtd/ubi-user.h>
48 #define INODE_LOCKED_MAX 64
50 struct super_block
*ubifs_sb
;
51 LIST_HEAD(super_blocks
);
53 static struct inode
*inodes_locked_down
[INODE_LOCKED_MAX
];
55 int set_anon_super(struct super_block
*s
, void *data
)
60 struct inode
*iget_locked(struct super_block
*sb
, unsigned long ino
)
64 inode
= (struct inode
*)malloc_cache_aligned(
65 sizeof(struct ubifs_inode
));
69 list_add(&inode
->i_sb_list
, &sb
->s_inodes
);
70 inode
->i_state
= I_LOCK
| I_NEW
;
76 void iget_failed(struct inode
*inode
)
80 int ubifs_iput(struct inode
*inode
)
82 list_del_init(&inode
->i_sb_list
);
89 * Lock (save) inode in inode array for readback after recovery
91 void iput(struct inode
*inode
)
99 for (i
= 0; i
< INODE_LOCKED_MAX
; i
++) {
100 if (inodes_locked_down
[i
] == NULL
)
104 if (i
>= INODE_LOCKED_MAX
) {
105 dbg_gen("Error, can't lock (save) more inodes while recovery!!!");
110 * Allocate and use new inode
112 ino
= (struct inode
*)malloc_cache_aligned(sizeof(struct ubifs_inode
));
113 memcpy(ino
, inode
, sizeof(struct ubifs_inode
));
116 * Finally save inode in array
118 inodes_locked_down
[i
] = ino
;
121 /* from fs/inode.c */
123 * clear_nlink - directly zero an inode's link count
126 * This is a low-level filesystem helper to replace any
127 * direct filesystem manipulation of i_nlink. See
128 * drop_nlink() for why we care about i_nlink hitting zero.
130 void clear_nlink(struct inode
*inode
)
132 if (inode
->i_nlink
) {
133 inode
->__i_nlink
= 0;
134 atomic_long_inc(&inode
->i_sb
->s_remove_count
);
137 EXPORT_SYMBOL(clear_nlink
);
140 * set_nlink - directly set an inode's link count
142 * @nlink: new nlink (should be non-zero)
144 * This is a low-level filesystem helper to replace any
145 * direct filesystem manipulation of i_nlink.
147 void set_nlink(struct inode
*inode
, unsigned int nlink
)
152 /* Yes, some filesystems do change nlink from zero to one */
153 if (inode
->i_nlink
== 0)
154 atomic_long_dec(&inode
->i_sb
->s_remove_count
);
156 inode
->__i_nlink
= nlink
;
159 EXPORT_SYMBOL(set_nlink
);
161 /* from include/linux/fs.h */
162 static inline void i_uid_write(struct inode
*inode
, uid_t uid
)
164 inode
->i_uid
.val
= uid
;
167 static inline void i_gid_write(struct inode
*inode
, gid_t gid
)
169 inode
->i_gid
.val
= gid
;
172 void unlock_new_inode(struct inode
*inode
)
179 * Maximum amount of memory we may 'kmalloc()' without worrying that we are
180 * allocating too much.
182 #define UBIFS_KMALLOC_OK (128*1024)
184 /* Slab cache for UBIFS inodes */
185 struct kmem_cache
*ubifs_inode_slab
;
188 /* UBIFS TNC shrinker description */
189 static struct shrinker ubifs_shrinker_info
= {
190 .scan_objects
= ubifs_shrink_scan
,
191 .count_objects
= ubifs_shrink_count
,
192 .seeks
= DEFAULT_SEEKS
,
197 * validate_inode - validate inode.
198 * @c: UBIFS file-system description object
199 * @inode: the inode to validate
201 * This is a helper function for 'ubifs_iget()' which validates various fields
202 * of a newly built inode to make sure they contain sane values and prevent
203 * possible vulnerabilities. Returns zero if the inode is all right and
204 * a non-zero error code if not.
206 static int validate_inode(struct ubifs_info
*c
, const struct inode
*inode
)
209 const struct ubifs_inode
*ui
= ubifs_inode(inode
);
211 if (inode
->i_size
> c
->max_inode_sz
) {
212 ubifs_err(c
, "inode is too large (%lld)",
213 (long long)inode
->i_size
);
217 if (ui
->compr_type
>= UBIFS_COMPR_TYPES_CNT
) {
218 ubifs_err(c
, "unknown compression type %d", ui
->compr_type
);
222 if (ui
->xattr_names
+ ui
->xattr_cnt
> XATTR_LIST_MAX
)
225 if (ui
->data_len
< 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
)
228 if (ui
->xattr
&& !S_ISREG(inode
->i_mode
))
231 if (!ubifs_compr_present(ui
->compr_type
)) {
232 ubifs_warn(c
, "inode %lu uses '%s' compression, but it was not compiled in",
233 inode
->i_ino
, ubifs_compr_name(ui
->compr_type
));
236 err
= dbg_check_dir(c
, inode
);
240 struct inode
*ubifs_iget(struct super_block
*sb
, unsigned long inum
)
244 struct ubifs_ino_node
*ino
;
245 struct ubifs_info
*c
= sb
->s_fs_info
;
247 struct ubifs_inode
*ui
;
252 dbg_gen("inode %lu", inum
);
256 * U-Boot special handling of locked down inodes via recovery
257 * e.g. ubifs_recover_size()
259 for (i
= 0; i
< INODE_LOCKED_MAX
; i
++) {
261 * Exit on last entry (NULL), inode not found in list
263 if (inodes_locked_down
[i
] == NULL
)
266 if (inodes_locked_down
[i
]->i_ino
== inum
) {
268 * We found the locked down inode in our array,
269 * so just return this pointer instead of creating
272 return inodes_locked_down
[i
];
277 inode
= iget_locked(sb
, inum
);
279 return ERR_PTR(-ENOMEM
);
280 if (!(inode
->i_state
& I_NEW
))
282 ui
= ubifs_inode(inode
);
284 ino
= kmalloc(UBIFS_MAX_INO_NODE_SZ
, GFP_NOFS
);
290 ino_key_init(c
, &key
, inode
->i_ino
);
292 err
= ubifs_tnc_lookup(c
, &key
, ino
);
296 inode
->i_flags
|= (S_NOCMTIME
| S_NOATIME
);
297 set_nlink(inode
, le32_to_cpu(ino
->nlink
));
298 i_uid_write(inode
, le32_to_cpu(ino
->uid
));
299 i_gid_write(inode
, le32_to_cpu(ino
->gid
));
300 inode
->i_atime
.tv_sec
= (int64_t)le64_to_cpu(ino
->atime_sec
);
301 inode
->i_atime
.tv_nsec
= le32_to_cpu(ino
->atime_nsec
);
302 inode
->i_mtime
.tv_sec
= (int64_t)le64_to_cpu(ino
->mtime_sec
);
303 inode
->i_mtime
.tv_nsec
= le32_to_cpu(ino
->mtime_nsec
);
304 inode
->i_ctime
.tv_sec
= (int64_t)le64_to_cpu(ino
->ctime_sec
);
305 inode
->i_ctime
.tv_nsec
= le32_to_cpu(ino
->ctime_nsec
);
306 inode
->i_mode
= le32_to_cpu(ino
->mode
);
307 inode
->i_size
= le64_to_cpu(ino
->size
);
309 ui
->data_len
= le32_to_cpu(ino
->data_len
);
310 ui
->flags
= le32_to_cpu(ino
->flags
);
311 ui
->compr_type
= le16_to_cpu(ino
->compr_type
);
312 ui
->creat_sqnum
= le64_to_cpu(ino
->creat_sqnum
);
313 ui
->xattr_cnt
= le32_to_cpu(ino
->xattr_cnt
);
314 ui
->xattr_size
= le32_to_cpu(ino
->xattr_size
);
315 ui
->xattr_names
= le32_to_cpu(ino
->xattr_names
);
316 ui
->synced_i_size
= ui
->ui_size
= inode
->i_size
;
318 ui
->xattr
= (ui
->flags
& UBIFS_XATTR_FL
) ? 1 : 0;
320 err
= validate_inode(c
, inode
);
325 switch (inode
->i_mode
& S_IFMT
) {
327 inode
->i_mapping
->a_ops
= &ubifs_file_address_operations
;
328 inode
->i_op
= &ubifs_file_inode_operations
;
329 inode
->i_fop
= &ubifs_file_operations
;
331 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
336 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
337 ((char *)ui
->data
)[ui
->data_len
] = '\0';
338 } else if (ui
->data_len
!= 0) {
344 inode
->i_op
= &ubifs_dir_inode_operations
;
345 inode
->i_fop
= &ubifs_dir_operations
;
346 if (ui
->data_len
!= 0) {
352 inode
->i_op
= &ubifs_symlink_inode_operations
;
353 if (ui
->data_len
<= 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
) {
357 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
362 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
363 ((char *)ui
->data
)[ui
->data_len
] = '\0';
364 inode
->i_link
= ui
->data
;
370 union ubifs_dev_desc
*dev
;
372 ui
->data
= kmalloc(sizeof(union ubifs_dev_desc
), GFP_NOFS
);
378 dev
= (union ubifs_dev_desc
*)ino
->data
;
379 if (ui
->data_len
== sizeof(dev
->new))
380 rdev
= new_decode_dev(le32_to_cpu(dev
->new));
381 else if (ui
->data_len
== sizeof(dev
->huge
))
382 rdev
= huge_decode_dev(le64_to_cpu(dev
->huge
));
387 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
388 inode
->i_op
= &ubifs_file_inode_operations
;
389 init_special_inode(inode
, inode
->i_mode
, rdev
);
394 inode
->i_op
= &ubifs_file_inode_operations
;
395 init_special_inode(inode
, inode
->i_mode
, 0);
396 if (ui
->data_len
!= 0) {
406 if ((inode
->i_mode
& S_IFMT
) == S_IFLNK
) {
407 if (ui
->data_len
<= 0 || ui
->data_len
> UBIFS_MAX_INO_DATA
) {
411 ui
->data
= kmalloc(ui
->data_len
+ 1, GFP_NOFS
);
416 memcpy(ui
->data
, ino
->data
, ui
->data_len
);
417 ((char *)ui
->data
)[ui
->data_len
] = '\0';
423 ubifs_set_inode_flags(inode
);
425 unlock_new_inode(inode
);
429 ubifs_err(c
, "inode %lu validation failed, error %d", inode
->i_ino
, err
);
430 ubifs_dump_node(c
, ino
);
431 ubifs_dump_inode(c
, inode
);
436 ubifs_err(c
, "failed to read inode %lu, error %d", inode
->i_ino
, err
);
441 static struct inode
*ubifs_alloc_inode(struct super_block
*sb
)
443 struct ubifs_inode
*ui
;
445 ui
= kmem_cache_alloc(ubifs_inode_slab
, GFP_NOFS
);
449 memset((void *)ui
+ sizeof(struct inode
), 0,
450 sizeof(struct ubifs_inode
) - sizeof(struct inode
));
451 mutex_init(&ui
->ui_mutex
);
452 spin_lock_init(&ui
->ui_lock
);
453 return &ui
->vfs_inode
;
457 static void ubifs_i_callback(struct rcu_head
*head
)
459 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
460 struct ubifs_inode
*ui
= ubifs_inode(inode
);
461 kmem_cache_free(ubifs_inode_slab
, ui
);
464 static void ubifs_destroy_inode(struct inode
*inode
)
466 struct ubifs_inode
*ui
= ubifs_inode(inode
);
469 call_rcu(&inode
->i_rcu
, ubifs_i_callback
);
473 * Note, Linux write-back code calls this without 'i_mutex'.
475 static int ubifs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
478 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
479 struct ubifs_inode
*ui
= ubifs_inode(inode
);
481 ubifs_assert(!ui
->xattr
);
482 if (is_bad_inode(inode
))
485 mutex_lock(&ui
->ui_mutex
);
487 * Due to races between write-back forced by budgeting
488 * (see 'sync_some_inodes()') and background write-back, the inode may
489 * have already been synchronized, do not do this again. This might
490 * also happen if it was synchronized in an VFS operation, e.g.
494 mutex_unlock(&ui
->ui_mutex
);
499 * As an optimization, do not write orphan inodes to the media just
500 * because this is not needed.
502 dbg_gen("inode %lu, mode %#x, nlink %u",
503 inode
->i_ino
, (int)inode
->i_mode
, inode
->i_nlink
);
504 if (inode
->i_nlink
) {
505 err
= ubifs_jnl_write_inode(c
, inode
);
507 ubifs_err(c
, "can't write inode %lu, error %d",
510 err
= dbg_check_inode_size(c
, inode
, ui
->ui_size
);
514 mutex_unlock(&ui
->ui_mutex
);
515 ubifs_release_dirty_inode_budget(c
, ui
);
519 static void ubifs_evict_inode(struct inode
*inode
)
522 struct ubifs_info
*c
= inode
->i_sb
->s_fs_info
;
523 struct ubifs_inode
*ui
= ubifs_inode(inode
);
527 * Extended attribute inode deletions are fully handled in
528 * 'ubifs_removexattr()'. These inodes are special and have
529 * limited usage, so there is nothing to do here.
533 dbg_gen("inode %lu, mode %#x", inode
->i_ino
, (int)inode
->i_mode
);
534 ubifs_assert(!atomic_read(&inode
->i_count
));
536 truncate_inode_pages_final(&inode
->i_data
);
541 if (is_bad_inode(inode
))
544 ui
->ui_size
= inode
->i_size
= 0;
545 err
= ubifs_jnl_delete_inode(c
, inode
);
548 * Worst case we have a lost orphan inode wasting space, so a
549 * simple error message is OK here.
551 ubifs_err(c
, "can't delete inode %lu, error %d",
556 ubifs_release_dirty_inode_budget(c
, ui
);
558 /* We've deleted something - clean the "no space" flags */
559 c
->bi
.nospace
= c
->bi
.nospace_rp
= 0;
567 static void ubifs_dirty_inode(struct inode
*inode
, int flags
)
569 struct ubifs_inode
*ui
= ubifs_inode(inode
);
571 ubifs_assert(mutex_is_locked(&ui
->ui_mutex
));
574 dbg_gen("inode %lu", inode
->i_ino
);
579 static int ubifs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
581 struct ubifs_info
*c
= dentry
->d_sb
->s_fs_info
;
582 unsigned long long free
;
583 __le32
*uuid
= (__le32
*)c
->uuid
;
585 free
= ubifs_get_free_space(c
);
586 dbg_gen("free space %lld bytes (%lld blocks)",
587 free
, free
>> UBIFS_BLOCK_SHIFT
);
589 buf
->f_type
= UBIFS_SUPER_MAGIC
;
590 buf
->f_bsize
= UBIFS_BLOCK_SIZE
;
591 buf
->f_blocks
= c
->block_cnt
;
592 buf
->f_bfree
= free
>> UBIFS_BLOCK_SHIFT
;
593 if (free
> c
->report_rp_size
)
594 buf
->f_bavail
= (free
- c
->report_rp_size
) >> UBIFS_BLOCK_SHIFT
;
599 buf
->f_namelen
= UBIFS_MAX_NLEN
;
600 buf
->f_fsid
.val
[0] = le32_to_cpu(uuid
[0]) ^ le32_to_cpu(uuid
[2]);
601 buf
->f_fsid
.val
[1] = le32_to_cpu(uuid
[1]) ^ le32_to_cpu(uuid
[3]);
602 ubifs_assert(buf
->f_bfree
<= c
->block_cnt
);
606 static int ubifs_show_options(struct seq_file
*s
, struct dentry
*root
)
608 struct ubifs_info
*c
= root
->d_sb
->s_fs_info
;
610 if (c
->mount_opts
.unmount_mode
== 2)
611 seq_puts(s
, ",fast_unmount");
612 else if (c
->mount_opts
.unmount_mode
== 1)
613 seq_puts(s
, ",norm_unmount");
615 if (c
->mount_opts
.bulk_read
== 2)
616 seq_puts(s
, ",bulk_read");
617 else if (c
->mount_opts
.bulk_read
== 1)
618 seq_puts(s
, ",no_bulk_read");
620 if (c
->mount_opts
.chk_data_crc
== 2)
621 seq_puts(s
, ",chk_data_crc");
622 else if (c
->mount_opts
.chk_data_crc
== 1)
623 seq_puts(s
, ",no_chk_data_crc");
625 if (c
->mount_opts
.override_compr
) {
626 seq_printf(s
, ",compr=%s",
627 ubifs_compr_name(c
->mount_opts
.compr_type
));
633 static int ubifs_sync_fs(struct super_block
*sb
, int wait
)
636 struct ubifs_info
*c
= sb
->s_fs_info
;
639 * Zero @wait is just an advisory thing to help the file system shove
640 * lots of data into the queues, and there will be the second
641 * '->sync_fs()' call, with non-zero @wait.
647 * Synchronize write buffers, because 'ubifs_run_commit()' does not
648 * do this if it waits for an already running commit.
650 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
651 err
= ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
657 * Strictly speaking, it is not necessary to commit the journal here,
658 * synchronizing write-buffers would be enough. But committing makes
659 * UBIFS free space predictions much more accurate, so we want to let
660 * the user be able to get more accurate results of 'statfs()' after
661 * they synchronize the file system.
663 err
= ubifs_run_commit(c
);
667 return ubi_sync(c
->vi
.ubi_num
);
672 * init_constants_early - initialize UBIFS constants.
673 * @c: UBIFS file-system description object
675 * This function initialize UBIFS constants which do not need the superblock to
676 * be read. It also checks that the UBI volume satisfies basic UBIFS
677 * requirements. Returns zero in case of success and a negative error code in
680 static int init_constants_early(struct ubifs_info
*c
)
682 if (c
->vi
.corrupted
) {
683 ubifs_warn(c
, "UBI volume is corrupted - read-only mode");
688 ubifs_msg(c
, "read-only UBI device");
692 if (c
->vi
.vol_type
== UBI_STATIC_VOLUME
) {
693 ubifs_msg(c
, "static UBI volume - read-only mode");
697 c
->leb_cnt
= c
->vi
.size
;
698 c
->leb_size
= c
->vi
.usable_leb_size
;
699 c
->leb_start
= c
->di
.leb_start
;
700 c
->half_leb_size
= c
->leb_size
/ 2;
701 c
->min_io_size
= c
->di
.min_io_size
;
702 c
->min_io_shift
= fls(c
->min_io_size
) - 1;
703 c
->max_write_size
= c
->di
.max_write_size
;
704 c
->max_write_shift
= fls(c
->max_write_size
) - 1;
706 if (c
->leb_size
< UBIFS_MIN_LEB_SZ
) {
707 ubifs_err(c
, "too small LEBs (%d bytes), min. is %d bytes",
708 c
->leb_size
, UBIFS_MIN_LEB_SZ
);
712 if (c
->leb_cnt
< UBIFS_MIN_LEB_CNT
) {
713 ubifs_err(c
, "too few LEBs (%d), min. is %d",
714 c
->leb_cnt
, UBIFS_MIN_LEB_CNT
);
718 if (!is_power_of_2(c
->min_io_size
)) {
719 ubifs_err(c
, "bad min. I/O size %d", c
->min_io_size
);
724 * Maximum write size has to be greater or equivalent to min. I/O
725 * size, and be multiple of min. I/O size.
727 if (c
->max_write_size
< c
->min_io_size
||
728 c
->max_write_size
% c
->min_io_size
||
729 !is_power_of_2(c
->max_write_size
)) {
730 ubifs_err(c
, "bad write buffer size %d for %d min. I/O unit",
731 c
->max_write_size
, c
->min_io_size
);
736 * UBIFS aligns all node to 8-byte boundary, so to make function in
737 * io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
740 if (c
->min_io_size
< 8) {
743 if (c
->max_write_size
< c
->min_io_size
) {
744 c
->max_write_size
= c
->min_io_size
;
745 c
->max_write_shift
= c
->min_io_shift
;
749 c
->ref_node_alsz
= ALIGN(UBIFS_REF_NODE_SZ
, c
->min_io_size
);
750 c
->mst_node_alsz
= ALIGN(UBIFS_MST_NODE_SZ
, c
->min_io_size
);
753 * Initialize node length ranges which are mostly needed for node
756 c
->ranges
[UBIFS_PAD_NODE
].len
= UBIFS_PAD_NODE_SZ
;
757 c
->ranges
[UBIFS_SB_NODE
].len
= UBIFS_SB_NODE_SZ
;
758 c
->ranges
[UBIFS_MST_NODE
].len
= UBIFS_MST_NODE_SZ
;
759 c
->ranges
[UBIFS_REF_NODE
].len
= UBIFS_REF_NODE_SZ
;
760 c
->ranges
[UBIFS_TRUN_NODE
].len
= UBIFS_TRUN_NODE_SZ
;
761 c
->ranges
[UBIFS_CS_NODE
].len
= UBIFS_CS_NODE_SZ
;
763 c
->ranges
[UBIFS_INO_NODE
].min_len
= UBIFS_INO_NODE_SZ
;
764 c
->ranges
[UBIFS_INO_NODE
].max_len
= UBIFS_MAX_INO_NODE_SZ
;
765 c
->ranges
[UBIFS_ORPH_NODE
].min_len
=
766 UBIFS_ORPH_NODE_SZ
+ sizeof(__le64
);
767 c
->ranges
[UBIFS_ORPH_NODE
].max_len
= c
->leb_size
;
768 c
->ranges
[UBIFS_DENT_NODE
].min_len
= UBIFS_DENT_NODE_SZ
;
769 c
->ranges
[UBIFS_DENT_NODE
].max_len
= UBIFS_MAX_DENT_NODE_SZ
;
770 c
->ranges
[UBIFS_XENT_NODE
].min_len
= UBIFS_XENT_NODE_SZ
;
771 c
->ranges
[UBIFS_XENT_NODE
].max_len
= UBIFS_MAX_XENT_NODE_SZ
;
772 c
->ranges
[UBIFS_DATA_NODE
].min_len
= UBIFS_DATA_NODE_SZ
;
773 c
->ranges
[UBIFS_DATA_NODE
].max_len
= UBIFS_MAX_DATA_NODE_SZ
;
775 * Minimum indexing node size is amended later when superblock is
776 * read and the key length is known.
778 c
->ranges
[UBIFS_IDX_NODE
].min_len
= UBIFS_IDX_NODE_SZ
+ UBIFS_BRANCH_SZ
;
780 * Maximum indexing node size is amended later when superblock is
781 * read and the fanout is known.
783 c
->ranges
[UBIFS_IDX_NODE
].max_len
= INT_MAX
;
786 * Initialize dead and dark LEB space watermarks. See gc.c for comments
787 * about these values.
789 c
->dead_wm
= ALIGN(MIN_WRITE_SZ
, c
->min_io_size
);
790 c
->dark_wm
= ALIGN(UBIFS_MAX_NODE_SZ
, c
->min_io_size
);
793 * Calculate how many bytes would be wasted at the end of LEB if it was
794 * fully filled with data nodes of maximum size. This is used in
795 * calculations when reporting free space.
797 c
->leb_overhead
= c
->leb_size
% UBIFS_MAX_DATA_NODE_SZ
;
799 /* Buffer size for bulk-reads */
800 c
->max_bu_buf_len
= UBIFS_MAX_BULK_READ
* UBIFS_MAX_DATA_NODE_SZ
;
801 if (c
->max_bu_buf_len
> c
->leb_size
)
802 c
->max_bu_buf_len
= c
->leb_size
;
807 * bud_wbuf_callback - bud LEB write-buffer synchronization call-back.
808 * @c: UBIFS file-system description object
809 * @lnum: LEB the write-buffer was synchronized to
810 * @free: how many free bytes left in this LEB
811 * @pad: how many bytes were padded
813 * This is a callback function which is called by the I/O unit when the
814 * write-buffer is synchronized. We need this to correctly maintain space
815 * accounting in bud logical eraseblocks. This function returns zero in case of
816 * success and a negative error code in case of failure.
818 * This function actually belongs to the journal, but we keep it here because
819 * we want to keep it static.
821 static int bud_wbuf_callback(struct ubifs_info
*c
, int lnum
, int free
, int pad
)
823 return ubifs_update_one_lp(c
, lnum
, free
, pad
, 0, 0);
827 * init_constants_sb - initialize UBIFS constants.
828 * @c: UBIFS file-system description object
830 * This is a helper function which initializes various UBIFS constants after
831 * the superblock has been read. It also checks various UBIFS parameters and
832 * makes sure they are all right. Returns zero in case of success and a
833 * negative error code in case of failure.
835 static int init_constants_sb(struct ubifs_info
*c
)
840 c
->main_bytes
= (long long)c
->main_lebs
* c
->leb_size
;
841 c
->max_znode_sz
= sizeof(struct ubifs_znode
) +
842 c
->fanout
* sizeof(struct ubifs_zbranch
);
844 tmp
= ubifs_idx_node_sz(c
, 1);
845 c
->ranges
[UBIFS_IDX_NODE
].min_len
= tmp
;
846 c
->min_idx_node_sz
= ALIGN(tmp
, 8);
848 tmp
= ubifs_idx_node_sz(c
, c
->fanout
);
849 c
->ranges
[UBIFS_IDX_NODE
].max_len
= tmp
;
850 c
->max_idx_node_sz
= ALIGN(tmp
, 8);
852 /* Make sure LEB size is large enough to fit full commit */
853 tmp
= UBIFS_CS_NODE_SZ
+ UBIFS_REF_NODE_SZ
* c
->jhead_cnt
;
854 tmp
= ALIGN(tmp
, c
->min_io_size
);
855 if (tmp
> c
->leb_size
) {
856 ubifs_err(c
, "too small LEB size %d, at least %d needed",
862 * Make sure that the log is large enough to fit reference nodes for
863 * all buds plus one reserved LEB.
865 tmp64
= c
->max_bud_bytes
+ c
->leb_size
- 1;
866 c
->max_bud_cnt
= div_u64(tmp64
, c
->leb_size
);
867 tmp
= (c
->ref_node_alsz
* c
->max_bud_cnt
+ c
->leb_size
- 1);
870 if (c
->log_lebs
< tmp
) {
871 ubifs_err(c
, "too small log %d LEBs, required min. %d LEBs",
877 * When budgeting we assume worst-case scenarios when the pages are not
878 * be compressed and direntries are of the maximum size.
880 * Note, data, which may be stored in inodes is budgeted separately, so
881 * it is not included into 'c->bi.inode_budget'.
883 c
->bi
.page_budget
= UBIFS_MAX_DATA_NODE_SZ
* UBIFS_BLOCKS_PER_PAGE
;
884 c
->bi
.inode_budget
= UBIFS_INO_NODE_SZ
;
885 c
->bi
.dent_budget
= UBIFS_MAX_DENT_NODE_SZ
;
888 * When the amount of flash space used by buds becomes
889 * 'c->max_bud_bytes', UBIFS just blocks all writers and starts commit.
890 * The writers are unblocked when the commit is finished. To avoid
891 * writers to be blocked UBIFS initiates background commit in advance,
892 * when number of bud bytes becomes above the limit defined below.
894 c
->bg_bud_bytes
= (c
->max_bud_bytes
* 13) >> 4;
897 * Ensure minimum journal size. All the bytes in the journal heads are
898 * considered to be used, when calculating the current journal usage.
899 * Consequently, if the journal is too small, UBIFS will treat it as
902 tmp64
= (long long)(c
->jhead_cnt
+ 1) * c
->leb_size
+ 1;
903 if (c
->bg_bud_bytes
< tmp64
)
904 c
->bg_bud_bytes
= tmp64
;
905 if (c
->max_bud_bytes
< tmp64
+ c
->leb_size
)
906 c
->max_bud_bytes
= tmp64
+ c
->leb_size
;
908 err
= ubifs_calc_lpt_geom(c
);
912 /* Initialize effective LEB size used in budgeting calculations */
913 c
->idx_leb_size
= c
->leb_size
- c
->max_idx_node_sz
;
918 * init_constants_master - initialize UBIFS constants.
919 * @c: UBIFS file-system description object
921 * This is a helper function which initializes various UBIFS constants after
922 * the master node has been read. It also checks various UBIFS parameters and
923 * makes sure they are all right.
925 static void init_constants_master(struct ubifs_info
*c
)
929 c
->bi
.min_idx_lebs
= ubifs_calc_min_idx_lebs(c
);
930 c
->report_rp_size
= ubifs_reported_space(c
, c
->rp_size
);
933 * Calculate total amount of FS blocks. This number is not used
934 * internally because it does not make much sense for UBIFS, but it is
935 * necessary to report something for the 'statfs()' call.
937 * Subtract the LEB reserved for GC, the LEB which is reserved for
938 * deletions, minimum LEBs for the index, and assume only one journal
941 tmp64
= c
->main_lebs
- 1 - 1 - MIN_INDEX_LEBS
- c
->jhead_cnt
+ 1;
942 tmp64
*= (long long)c
->leb_size
- c
->leb_overhead
;
943 tmp64
= ubifs_reported_space(c
, tmp64
);
944 c
->block_cnt
= tmp64
>> UBIFS_BLOCK_SHIFT
;
948 * take_gc_lnum - reserve GC LEB.
949 * @c: UBIFS file-system description object
951 * This function ensures that the LEB reserved for garbage collection is marked
952 * as "taken" in lprops. We also have to set free space to LEB size and dirty
953 * space to zero, because lprops may contain out-of-date information if the
954 * file-system was un-mounted before it has been committed. This function
955 * returns zero in case of success and a negative error code in case of
958 static int take_gc_lnum(struct ubifs_info
*c
)
962 if (c
->gc_lnum
== -1) {
963 ubifs_err(c
, "no LEB for GC");
967 /* And we have to tell lprops that this LEB is taken */
968 err
= ubifs_change_one_lp(c
, c
->gc_lnum
, c
->leb_size
, 0,
974 * alloc_wbufs - allocate write-buffers.
975 * @c: UBIFS file-system description object
977 * This helper function allocates and initializes UBIFS write-buffers. Returns
978 * zero in case of success and %-ENOMEM in case of failure.
980 static int alloc_wbufs(struct ubifs_info
*c
)
984 c
->jheads
= kcalloc(c
->jhead_cnt
, sizeof(struct ubifs_jhead
),
989 /* Initialize journal heads */
990 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
991 INIT_LIST_HEAD(&c
->jheads
[i
].buds_list
);
992 err
= ubifs_wbuf_init(c
, &c
->jheads
[i
].wbuf
);
996 c
->jheads
[i
].wbuf
.sync_callback
= &bud_wbuf_callback
;
997 c
->jheads
[i
].wbuf
.jhead
= i
;
998 c
->jheads
[i
].grouped
= 1;
1002 * Garbage Collector head does not need to be synchronized by timer.
1003 * Also GC head nodes are not grouped.
1005 c
->jheads
[GCHD
].wbuf
.no_timer
= 1;
1006 c
->jheads
[GCHD
].grouped
= 0;
1012 * free_wbufs - free write-buffers.
1013 * @c: UBIFS file-system description object
1015 static void free_wbufs(struct ubifs_info
*c
)
1020 for (i
= 0; i
< c
->jhead_cnt
; i
++) {
1021 kfree(c
->jheads
[i
].wbuf
.buf
);
1022 kfree(c
->jheads
[i
].wbuf
.inodes
);
1030 * free_orphans - free orphans.
1031 * @c: UBIFS file-system description object
1033 static void free_orphans(struct ubifs_info
*c
)
1035 struct ubifs_orphan
*orph
;
1037 while (c
->orph_dnext
) {
1038 orph
= c
->orph_dnext
;
1039 c
->orph_dnext
= orph
->dnext
;
1040 list_del(&orph
->list
);
1044 while (!list_empty(&c
->orph_list
)) {
1045 orph
= list_entry(c
->orph_list
.next
, struct ubifs_orphan
, list
);
1046 list_del(&orph
->list
);
1048 ubifs_err(c
, "orphan list not empty at unmount");
1056 * free_buds - free per-bud objects.
1057 * @c: UBIFS file-system description object
1059 static void free_buds(struct ubifs_info
*c
)
1061 struct ubifs_bud
*bud
, *n
;
1063 rbtree_postorder_for_each_entry_safe(bud
, n
, &c
->buds
, rb
)
1068 * check_volume_empty - check if the UBI volume is empty.
1069 * @c: UBIFS file-system description object
1071 * This function checks if the UBIFS volume is empty by looking if its LEBs are
1072 * mapped or not. The result of checking is stored in the @c->empty variable.
1073 * Returns zero in case of success and a negative error code in case of
1076 static int check_volume_empty(struct ubifs_info
*c
)
1081 for (lnum
= 0; lnum
< c
->leb_cnt
; lnum
++) {
1082 err
= ubifs_is_mapped(c
, lnum
);
1083 if (unlikely(err
< 0))
1097 * UBIFS mount options.
1099 * Opt_fast_unmount: do not run a journal commit before un-mounting
1100 * Opt_norm_unmount: run a journal commit before un-mounting
1101 * Opt_bulk_read: enable bulk-reads
1102 * Opt_no_bulk_read: disable bulk-reads
1103 * Opt_chk_data_crc: check CRCs when reading data nodes
1104 * Opt_no_chk_data_crc: do not check CRCs when reading data nodes
1105 * Opt_override_compr: override default compressor
1106 * Opt_err: just end of array marker
1114 Opt_no_chk_data_crc
,
1120 static const match_table_t tokens
= {
1121 {Opt_fast_unmount
, "fast_unmount"},
1122 {Opt_norm_unmount
, "norm_unmount"},
1123 {Opt_bulk_read
, "bulk_read"},
1124 {Opt_no_bulk_read
, "no_bulk_read"},
1125 {Opt_chk_data_crc
, "chk_data_crc"},
1126 {Opt_no_chk_data_crc
, "no_chk_data_crc"},
1127 {Opt_override_compr
, "compr=%s"},
1132 * parse_standard_option - parse a standard mount option.
1133 * @option: the option to parse
1135 * Normally, standard mount options like "sync" are passed to file-systems as
1136 * flags. However, when a "rootflags=" kernel boot parameter is used, they may
1137 * be present in the options string. This function tries to deal with this
1138 * situation and parse standard options. Returns 0 if the option was not
1139 * recognized, and the corresponding integer flag if it was.
1141 * UBIFS is only interested in the "sync" option, so do not check for anything
1144 static int parse_standard_option(const char *option
)
1147 pr_notice("UBIFS: parse %s\n", option
);
1148 if (!strcmp(option
, "sync"))
1149 return MS_SYNCHRONOUS
;
1154 * ubifs_parse_options - parse mount parameters.
1155 * @c: UBIFS file-system description object
1156 * @options: parameters to parse
1157 * @is_remount: non-zero if this is FS re-mount
1159 * This function parses UBIFS mount options and returns zero in case success
1160 * and a negative error code in case of failure.
1162 static int ubifs_parse_options(struct ubifs_info
*c
, char *options
,
1166 substring_t args
[MAX_OPT_ARGS
];
1171 while ((p
= strsep(&options
, ","))) {
1177 token
= match_token(p
, tokens
, args
);
1180 * %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
1181 * We accept them in order to be backward-compatible. But this
1182 * should be removed at some point.
1184 case Opt_fast_unmount
:
1185 c
->mount_opts
.unmount_mode
= 2;
1187 case Opt_norm_unmount
:
1188 c
->mount_opts
.unmount_mode
= 1;
1191 c
->mount_opts
.bulk_read
= 2;
1194 case Opt_no_bulk_read
:
1195 c
->mount_opts
.bulk_read
= 1;
1198 case Opt_chk_data_crc
:
1199 c
->mount_opts
.chk_data_crc
= 2;
1200 c
->no_chk_data_crc
= 0;
1202 case Opt_no_chk_data_crc
:
1203 c
->mount_opts
.chk_data_crc
= 1;
1204 c
->no_chk_data_crc
= 1;
1206 case Opt_override_compr
:
1208 char *name
= match_strdup(&args
[0]);
1212 if (!strcmp(name
, "none"))
1213 c
->mount_opts
.compr_type
= UBIFS_COMPR_NONE
;
1214 else if (!strcmp(name
, "lzo"))
1215 c
->mount_opts
.compr_type
= UBIFS_COMPR_LZO
;
1216 else if (!strcmp(name
, "zlib"))
1217 c
->mount_opts
.compr_type
= UBIFS_COMPR_ZLIB
;
1219 ubifs_err(c
, "unknown compressor \"%s\"", name
); //FIXME: is c ready?
1224 c
->mount_opts
.override_compr
= 1;
1225 c
->default_compr
= c
->mount_opts
.compr_type
;
1231 struct super_block
*sb
= c
->vfs_sb
;
1233 flag
= parse_standard_option(p
);
1235 ubifs_err(c
, "unrecognized mount option \"%s\" or missing value",
1239 sb
->s_flags
|= flag
;
1250 * destroy_journal - destroy journal data structures.
1251 * @c: UBIFS file-system description object
1253 * This function destroys journal data structures including those that may have
1254 * been created by recovery functions.
1256 static void destroy_journal(struct ubifs_info
*c
)
1258 while (!list_empty(&c
->unclean_leb_list
)) {
1259 struct ubifs_unclean_leb
*ucleb
;
1261 ucleb
= list_entry(c
->unclean_leb_list
.next
,
1262 struct ubifs_unclean_leb
, list
);
1263 list_del(&ucleb
->list
);
1266 while (!list_empty(&c
->old_buds
)) {
1267 struct ubifs_bud
*bud
;
1269 bud
= list_entry(c
->old_buds
.next
, struct ubifs_bud
, list
);
1270 list_del(&bud
->list
);
1273 ubifs_destroy_idx_gc(c
);
1274 ubifs_destroy_size_tree(c
);
1280 * bu_init - initialize bulk-read information.
1281 * @c: UBIFS file-system description object
1283 static void bu_init(struct ubifs_info
*c
)
1285 ubifs_assert(c
->bulk_read
== 1);
1288 return; /* Already initialized */
1291 c
->bu
.buf
= kmalloc(c
->max_bu_buf_len
, GFP_KERNEL
| __GFP_NOWARN
);
1293 if (c
->max_bu_buf_len
> UBIFS_KMALLOC_OK
) {
1294 c
->max_bu_buf_len
= UBIFS_KMALLOC_OK
;
1298 /* Just disable bulk-read */
1299 ubifs_warn(c
, "cannot allocate %d bytes of memory for bulk-read, disabling it",
1301 c
->mount_opts
.bulk_read
= 1;
1309 * check_free_space - check if there is enough free space to mount.
1310 * @c: UBIFS file-system description object
1312 * This function makes sure UBIFS has enough free space to be mounted in
1313 * read/write mode. UBIFS must always have some free space to allow deletions.
1315 static int check_free_space(struct ubifs_info
*c
)
1317 ubifs_assert(c
->dark_wm
> 0);
1318 if (c
->lst
.total_free
+ c
->lst
.total_dirty
< c
->dark_wm
) {
1319 ubifs_err(c
, "insufficient free space to mount in R/W mode");
1320 ubifs_dump_budg(c
, &c
->bi
);
1321 ubifs_dump_lprops(c
);
1329 * mount_ubifs - mount UBIFS file-system.
1330 * @c: UBIFS file-system description object
1332 * This function mounts UBIFS file system. Returns zero in case of success and
1333 * a negative error code in case of failure.
1335 static int mount_ubifs(struct ubifs_info
*c
)
1341 c
->ro_mount
= !!(c
->vfs_sb
->s_flags
& MS_RDONLY
);
1342 /* Suppress error messages while probing if MS_SILENT is set */
1343 c
->probing
= !!(c
->vfs_sb
->s_flags
& MS_SILENT
);
1346 printf("UBIFS: only ro mode in U-Boot allowed.\n");
1351 err
= init_constants_early(c
);
1355 err
= ubifs_debugging_init(c
);
1359 err
= check_volume_empty(c
);
1363 if (c
->empty
&& (c
->ro_mount
|| c
->ro_media
)) {
1365 * This UBI volume is empty, and read-only, or the file system
1366 * is mounted read-only - we cannot format it.
1368 ubifs_err(c
, "can't format empty UBI volume: read-only %s",
1369 c
->ro_media
? "UBI volume" : "mount");
1374 if (c
->ro_media
&& !c
->ro_mount
) {
1375 ubifs_err(c
, "cannot mount read-write - read-only media");
1381 * The requirement for the buffer is that it should fit indexing B-tree
1382 * height amount of integers. We assume the height if the TNC tree will
1386 c
->bottom_up_buf
= kmalloc(BOTTOM_UP_HEIGHT
* sizeof(int), GFP_KERNEL
);
1387 if (!c
->bottom_up_buf
)
1390 c
->sbuf
= vmalloc(c
->leb_size
);
1396 c
->ileb_buf
= vmalloc(c
->leb_size
);
1402 if (c
->bulk_read
== 1)
1407 c
->write_reserve_buf
= kmalloc(COMPRESSED_DATA_NODE_BUF_SZ
,
1409 if (!c
->write_reserve_buf
)
1416 err
= ubifs_read_superblock(c
);
1423 * Make sure the compressor which is set as default in the superblock
1424 * or overridden by mount options is actually compiled in.
1426 if (!ubifs_compr_present(c
->default_compr
)) {
1427 ubifs_err(c
, "'compressor \"%s\" is not compiled in",
1428 ubifs_compr_name(c
->default_compr
));
1433 err
= init_constants_sb(c
);
1437 sz
= ALIGN(c
->max_idx_node_sz
, c
->min_io_size
);
1438 sz
= ALIGN(sz
+ c
->max_idx_node_sz
, c
->min_io_size
);
1439 c
->cbuf
= kmalloc(sz
, GFP_NOFS
);
1445 err
= alloc_wbufs(c
);
1449 sprintf(c
->bgt_name
, BGT_NAME_PATTERN
, c
->vi
.ubi_num
, c
->vi
.vol_id
);
1452 /* Create background thread */
1453 c
->bgt
= kthread_create(ubifs_bg_thread
, c
, "%s", c
->bgt_name
);
1454 if (IS_ERR(c
->bgt
)) {
1455 err
= PTR_ERR(c
->bgt
);
1457 ubifs_err(c
, "cannot spawn \"%s\", error %d",
1461 wake_up_process(c
->bgt
);
1465 err
= ubifs_read_master(c
);
1469 init_constants_master(c
);
1471 if ((c
->mst_node
->flags
& cpu_to_le32(UBIFS_MST_DIRTY
)) != 0) {
1472 ubifs_msg(c
, "recovery needed");
1473 c
->need_recovery
= 1;
1477 if (c
->need_recovery
&& !c
->ro_mount
) {
1478 err
= ubifs_recover_inl_heads(c
, c
->sbuf
);
1484 err
= ubifs_lpt_init(c
, 1, !c
->ro_mount
);
1489 if (!c
->ro_mount
&& c
->space_fixup
) {
1490 err
= ubifs_fixup_free_space(c
);
1495 if (!c
->ro_mount
&& !c
->need_recovery
) {
1497 * Set the "dirty" flag so that if we reboot uncleanly we
1498 * will notice this immediately on the next mount.
1500 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_DIRTY
);
1501 err
= ubifs_write_master(c
);
1507 err
= dbg_check_idx_size(c
, c
->bi
.old_idx_sz
);
1511 err
= ubifs_replay_journal(c
);
1515 /* Calculate 'min_idx_lebs' after journal replay */
1516 c
->bi
.min_idx_lebs
= ubifs_calc_min_idx_lebs(c
);
1518 err
= ubifs_mount_orphans(c
, c
->need_recovery
, c
->ro_mount
);
1526 err
= check_free_space(c
);
1530 /* Check for enough log space */
1531 lnum
= c
->lhead_lnum
+ 1;
1532 if (lnum
>= UBIFS_LOG_LNUM
+ c
->log_lebs
)
1533 lnum
= UBIFS_LOG_LNUM
;
1534 if (lnum
== c
->ltail_lnum
) {
1535 err
= ubifs_consolidate_log(c
);
1540 if (c
->need_recovery
) {
1541 err
= ubifs_recover_size(c
);
1544 err
= ubifs_rcvry_gc_commit(c
);
1548 err
= take_gc_lnum(c
);
1553 * GC LEB may contain garbage if there was an unclean
1554 * reboot, and it should be un-mapped.
1556 err
= ubifs_leb_unmap(c
, c
->gc_lnum
);
1561 err
= dbg_check_lprops(c
);
1565 } else if (c
->need_recovery
) {
1566 err
= ubifs_recover_size(c
);
1571 * Even if we mount read-only, we have to set space in GC LEB
1572 * to proper value because this affects UBIFS free space
1573 * reporting. We do not want to have a situation when
1574 * re-mounting from R/O to R/W changes amount of free space.
1576 err
= take_gc_lnum(c
);
1582 spin_lock(&ubifs_infos_lock
);
1583 list_add_tail(&c
->infos_list
, &ubifs_infos
);
1584 spin_unlock(&ubifs_infos_lock
);
1587 if (c
->need_recovery
) {
1589 ubifs_msg(c
, "recovery deferred");
1591 c
->need_recovery
= 0;
1592 ubifs_msg(c
, "recovery completed");
1594 * GC LEB has to be empty and taken at this point. But
1595 * the journal head LEBs may also be accounted as
1596 * "empty taken" if they are empty.
1598 ubifs_assert(c
->lst
.taken_empty_lebs
> 0);
1601 ubifs_assert(c
->lst
.taken_empty_lebs
> 0);
1603 err
= dbg_check_filesystem(c
);
1607 err
= dbg_debugfs_init_fs(c
);
1613 ubifs_msg(c
, "UBIFS: mounted UBI device %d, volume %d, name \"%s\"%s",
1614 c
->vi
.ubi_num
, c
->vi
.vol_id
, c
->vi
.name
,
1615 c
->ro_mount
? ", R/O mode" : "");
1616 x
= (long long)c
->main_lebs
* c
->leb_size
;
1617 y
= (long long)c
->log_lebs
* c
->leb_size
+ c
->max_bud_bytes
;
1618 ubifs_msg(c
, "LEB size: %d bytes (%d KiB), min./max. I/O unit sizes: %d bytes/%d bytes",
1619 c
->leb_size
, c
->leb_size
>> 10, c
->min_io_size
,
1621 ubifs_msg(c
, "FS size: %lld bytes (%lld MiB, %d LEBs), journal size %lld bytes (%lld MiB, %d LEBs)",
1622 x
, x
>> 20, c
->main_lebs
,
1623 y
, y
>> 20, c
->log_lebs
+ c
->max_bud_cnt
);
1624 ubifs_msg(c
, "reserved for root: %llu bytes (%llu KiB)",
1625 c
->report_rp_size
, c
->report_rp_size
>> 10);
1626 ubifs_msg(c
, "media format: w%d/r%d (latest is w%d/r%d), UUID %pUB%s",
1627 c
->fmt_version
, c
->ro_compat_version
,
1628 UBIFS_FORMAT_VERSION
, UBIFS_RO_COMPAT_VERSION
, c
->uuid
,
1629 c
->big_lpt
? ", big LPT model" : ", small LPT model");
1631 dbg_gen("default compressor: %s", ubifs_compr_name(c
->default_compr
));
1632 dbg_gen("data journal heads: %d",
1633 c
->jhead_cnt
- NONDATA_JHEADS_CNT
);
1634 dbg_gen("log LEBs: %d (%d - %d)",
1635 c
->log_lebs
, UBIFS_LOG_LNUM
, c
->log_last
);
1636 dbg_gen("LPT area LEBs: %d (%d - %d)",
1637 c
->lpt_lebs
, c
->lpt_first
, c
->lpt_last
);
1638 dbg_gen("orphan area LEBs: %d (%d - %d)",
1639 c
->orph_lebs
, c
->orph_first
, c
->orph_last
);
1640 dbg_gen("main area LEBs: %d (%d - %d)",
1641 c
->main_lebs
, c
->main_first
, c
->leb_cnt
- 1);
1642 dbg_gen("index LEBs: %d", c
->lst
.idx_lebs
);
1643 dbg_gen("total index bytes: %lld (%lld KiB, %lld MiB)",
1644 c
->bi
.old_idx_sz
, c
->bi
.old_idx_sz
>> 10,
1645 c
->bi
.old_idx_sz
>> 20);
1646 dbg_gen("key hash type: %d", c
->key_hash_type
);
1647 dbg_gen("tree fanout: %d", c
->fanout
);
1648 dbg_gen("reserved GC LEB: %d", c
->gc_lnum
);
1649 dbg_gen("max. znode size %d", c
->max_znode_sz
);
1650 dbg_gen("max. index node size %d", c
->max_idx_node_sz
);
1651 dbg_gen("node sizes: data %zu, inode %zu, dentry %zu",
1652 UBIFS_DATA_NODE_SZ
, UBIFS_INO_NODE_SZ
, UBIFS_DENT_NODE_SZ
);
1653 dbg_gen("node sizes: trun %zu, sb %zu, master %zu",
1654 UBIFS_TRUN_NODE_SZ
, UBIFS_SB_NODE_SZ
, UBIFS_MST_NODE_SZ
);
1655 dbg_gen("node sizes: ref %zu, cmt. start %zu, orph %zu",
1656 UBIFS_REF_NODE_SZ
, UBIFS_CS_NODE_SZ
, UBIFS_ORPH_NODE_SZ
);
1657 dbg_gen("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
1658 UBIFS_MAX_DATA_NODE_SZ
, UBIFS_MAX_INO_NODE_SZ
,
1659 UBIFS_MAX_DENT_NODE_SZ
, ubifs_idx_node_sz(c
, c
->fanout
));
1660 dbg_gen("dead watermark: %d", c
->dead_wm
);
1661 dbg_gen("dark watermark: %d", c
->dark_wm
);
1662 dbg_gen("LEB overhead: %d", c
->leb_overhead
);
1663 x
= (long long)c
->main_lebs
* c
->dark_wm
;
1664 dbg_gen("max. dark space: %lld (%lld KiB, %lld MiB)",
1665 x
, x
>> 10, x
>> 20);
1666 dbg_gen("maximum bud bytes: %lld (%lld KiB, %lld MiB)",
1667 c
->max_bud_bytes
, c
->max_bud_bytes
>> 10,
1668 c
->max_bud_bytes
>> 20);
1669 dbg_gen("BG commit bud bytes: %lld (%lld KiB, %lld MiB)",
1670 c
->bg_bud_bytes
, c
->bg_bud_bytes
>> 10,
1671 c
->bg_bud_bytes
>> 20);
1672 dbg_gen("current bud bytes %lld (%lld KiB, %lld MiB)",
1673 c
->bud_bytes
, c
->bud_bytes
>> 10, c
->bud_bytes
>> 20);
1674 dbg_gen("max. seq. number: %llu", c
->max_sqnum
);
1675 dbg_gen("commit number: %llu", c
->cmt_no
);
1680 spin_lock(&ubifs_infos_lock
);
1681 list_del(&c
->infos_list
);
1682 spin_unlock(&ubifs_infos_lock
);
1688 ubifs_lpt_free(c
, 0);
1691 kfree(c
->rcvrd_mst_node
);
1693 kthread_stop(c
->bgt
);
1701 kfree(c
->write_reserve_buf
);
1705 kfree(c
->bottom_up_buf
);
1706 ubifs_debugging_exit(c
);
1711 * ubifs_umount - un-mount UBIFS file-system.
1712 * @c: UBIFS file-system description object
1714 * Note, this function is called to free allocated resourced when un-mounting,
1715 * as well as free resources when an error occurred while we were half way
1716 * through mounting (error path cleanup function). So it has to make sure the
1717 * resource was actually allocated before freeing it.
1720 static void ubifs_umount(struct ubifs_info
*c
)
1722 void ubifs_umount(struct ubifs_info
*c
)
1725 dbg_gen("un-mounting UBI device %d, volume %d", c
->vi
.ubi_num
,
1728 dbg_debugfs_exit_fs(c
);
1729 spin_lock(&ubifs_infos_lock
);
1730 list_del(&c
->infos_list
);
1731 spin_unlock(&ubifs_infos_lock
);
1735 kthread_stop(c
->bgt
);
1741 ubifs_lpt_free(c
, 0);
1744 kfree(c
->rcvrd_mst_node
);
1746 kfree(c
->write_reserve_buf
);
1750 kfree(c
->bottom_up_buf
);
1751 ubifs_debugging_exit(c
);
1753 /* Finally free U-Boot's global copy of superblock */
1754 if (ubifs_sb
!= NULL
) {
1755 free(ubifs_sb
->s_fs_info
);
1763 * ubifs_remount_rw - re-mount in read-write mode.
1764 * @c: UBIFS file-system description object
1766 * UBIFS avoids allocating many unnecessary resources when mounted in read-only
1767 * mode. This function allocates the needed resources and re-mounts UBIFS in
1770 static int ubifs_remount_rw(struct ubifs_info
*c
)
1774 if (c
->rw_incompat
) {
1775 ubifs_err(c
, "the file-system is not R/W-compatible");
1776 ubifs_msg(c
, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
1777 c
->fmt_version
, c
->ro_compat_version
,
1778 UBIFS_FORMAT_VERSION
, UBIFS_RO_COMPAT_VERSION
);
1782 mutex_lock(&c
->umount_mutex
);
1783 dbg_save_space_info(c
);
1784 c
->remounting_rw
= 1;
1787 if (c
->space_fixup
) {
1788 err
= ubifs_fixup_free_space(c
);
1793 err
= check_free_space(c
);
1797 if (c
->old_leb_cnt
!= c
->leb_cnt
) {
1798 struct ubifs_sb_node
*sup
;
1800 sup
= ubifs_read_sb_node(c
);
1805 sup
->leb_cnt
= cpu_to_le32(c
->leb_cnt
);
1806 err
= ubifs_write_sb_node(c
, sup
);
1812 if (c
->need_recovery
) {
1813 ubifs_msg(c
, "completing deferred recovery");
1814 err
= ubifs_write_rcvrd_mst_node(c
);
1817 err
= ubifs_recover_size(c
);
1820 err
= ubifs_clean_lebs(c
, c
->sbuf
);
1823 err
= ubifs_recover_inl_heads(c
, c
->sbuf
);
1827 /* A readonly mount is not allowed to have orphans */
1828 ubifs_assert(c
->tot_orphans
== 0);
1829 err
= ubifs_clear_orphans(c
);
1834 if (!(c
->mst_node
->flags
& cpu_to_le32(UBIFS_MST_DIRTY
))) {
1835 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_DIRTY
);
1836 err
= ubifs_write_master(c
);
1841 c
->ileb_buf
= vmalloc(c
->leb_size
);
1847 c
->write_reserve_buf
= kmalloc(COMPRESSED_DATA_NODE_BUF_SZ
, GFP_KERNEL
);
1848 if (!c
->write_reserve_buf
) {
1853 err
= ubifs_lpt_init(c
, 0, 1);
1857 /* Create background thread */
1858 c
->bgt
= kthread_create(ubifs_bg_thread
, c
, "%s", c
->bgt_name
);
1859 if (IS_ERR(c
->bgt
)) {
1860 err
= PTR_ERR(c
->bgt
);
1862 ubifs_err(c
, "cannot spawn \"%s\", error %d",
1866 wake_up_process(c
->bgt
);
1868 c
->orph_buf
= vmalloc(c
->leb_size
);
1874 /* Check for enough log space */
1875 lnum
= c
->lhead_lnum
+ 1;
1876 if (lnum
>= UBIFS_LOG_LNUM
+ c
->log_lebs
)
1877 lnum
= UBIFS_LOG_LNUM
;
1878 if (lnum
== c
->ltail_lnum
) {
1879 err
= ubifs_consolidate_log(c
);
1884 if (c
->need_recovery
)
1885 err
= ubifs_rcvry_gc_commit(c
);
1887 err
= ubifs_leb_unmap(c
, c
->gc_lnum
);
1891 dbg_gen("re-mounted read-write");
1892 c
->remounting_rw
= 0;
1894 if (c
->need_recovery
) {
1895 c
->need_recovery
= 0;
1896 ubifs_msg(c
, "deferred recovery completed");
1899 * Do not run the debugging space check if the were doing
1900 * recovery, because when we saved the information we had the
1901 * file-system in a state where the TNC and lprops has been
1902 * modified in memory, but all the I/O operations (including a
1903 * commit) were deferred. So the file-system was in
1904 * "non-committed" state. Now the file-system is in committed
1905 * state, and of course the amount of free space will change
1906 * because, for example, the old index size was imprecise.
1908 err
= dbg_check_space_info(c
);
1911 mutex_unlock(&c
->umount_mutex
);
1919 kthread_stop(c
->bgt
);
1923 kfree(c
->write_reserve_buf
);
1924 c
->write_reserve_buf
= NULL
;
1927 ubifs_lpt_free(c
, 1);
1928 c
->remounting_rw
= 0;
1929 mutex_unlock(&c
->umount_mutex
);
1934 * ubifs_remount_ro - re-mount in read-only mode.
1935 * @c: UBIFS file-system description object
1937 * We assume VFS has stopped writing. Possibly the background thread could be
1938 * running a commit, however kthread_stop will wait in that case.
1940 static void ubifs_remount_ro(struct ubifs_info
*c
)
1944 ubifs_assert(!c
->need_recovery
);
1945 ubifs_assert(!c
->ro_mount
);
1947 mutex_lock(&c
->umount_mutex
);
1949 kthread_stop(c
->bgt
);
1953 dbg_save_space_info(c
);
1955 for (i
= 0; i
< c
->jhead_cnt
; i
++)
1956 ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
1958 c
->mst_node
->flags
&= ~cpu_to_le32(UBIFS_MST_DIRTY
);
1959 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_NO_ORPHS
);
1960 c
->mst_node
->gc_lnum
= cpu_to_le32(c
->gc_lnum
);
1961 err
= ubifs_write_master(c
);
1963 ubifs_ro_mode(c
, err
);
1967 kfree(c
->write_reserve_buf
);
1968 c
->write_reserve_buf
= NULL
;
1971 ubifs_lpt_free(c
, 1);
1973 err
= dbg_check_space_info(c
);
1975 ubifs_ro_mode(c
, err
);
1976 mutex_unlock(&c
->umount_mutex
);
1979 static void ubifs_put_super(struct super_block
*sb
)
1982 struct ubifs_info
*c
= sb
->s_fs_info
;
1984 ubifs_msg(c
, "un-mount UBI device %d", c
->vi
.ubi_num
);
1987 * The following asserts are only valid if there has not been a failure
1988 * of the media. For example, there will be dirty inodes if we failed
1989 * to write them back because of I/O errors.
1992 ubifs_assert(c
->bi
.idx_growth
== 0);
1993 ubifs_assert(c
->bi
.dd_growth
== 0);
1994 ubifs_assert(c
->bi
.data_growth
== 0);
1998 * The 'c->umount_lock' prevents races between UBIFS memory shrinker
1999 * and file system un-mount. Namely, it prevents the shrinker from
2000 * picking this superblock for shrinking - it will be just skipped if
2001 * the mutex is locked.
2003 mutex_lock(&c
->umount_mutex
);
2006 * First of all kill the background thread to make sure it does
2007 * not interfere with un-mounting and freeing resources.
2010 kthread_stop(c
->bgt
);
2015 * On fatal errors c->ro_error is set to 1, in which case we do
2016 * not write the master node.
2021 /* Synchronize write-buffers */
2022 for (i
= 0; i
< c
->jhead_cnt
; i
++)
2023 ubifs_wbuf_sync(&c
->jheads
[i
].wbuf
);
2026 * We are being cleanly unmounted which means the
2027 * orphans were killed - indicate this in the master
2028 * node. Also save the reserved GC LEB number.
2030 c
->mst_node
->flags
&= ~cpu_to_le32(UBIFS_MST_DIRTY
);
2031 c
->mst_node
->flags
|= cpu_to_le32(UBIFS_MST_NO_ORPHS
);
2032 c
->mst_node
->gc_lnum
= cpu_to_le32(c
->gc_lnum
);
2033 err
= ubifs_write_master(c
);
2036 * Recovery will attempt to fix the master area
2037 * next mount, so we just print a message and
2038 * continue to unmount normally.
2040 ubifs_err(c
, "failed to write master node, error %d",
2044 for (i
= 0; i
< c
->jhead_cnt
; i
++)
2045 /* Make sure write-buffer timers are canceled */
2046 hrtimer_cancel(&c
->jheads
[i
].wbuf
.timer
);
2053 bdi_destroy(&c
->bdi
);
2055 ubi_close_volume(c
->ubi
);
2056 mutex_unlock(&c
->umount_mutex
);
2061 static int ubifs_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
2064 struct ubifs_info
*c
= sb
->s_fs_info
;
2066 sync_filesystem(sb
);
2067 dbg_gen("old flags %#lx, new flags %#x", sb
->s_flags
, *flags
);
2069 err
= ubifs_parse_options(c
, data
, 1);
2071 ubifs_err(c
, "invalid or unknown remount parameter");
2075 if (c
->ro_mount
&& !(*flags
& MS_RDONLY
)) {
2077 ubifs_msg(c
, "cannot re-mount R/W due to prior errors");
2081 ubifs_msg(c
, "cannot re-mount R/W - UBI volume is R/O");
2084 err
= ubifs_remount_rw(c
);
2087 } else if (!c
->ro_mount
&& (*flags
& MS_RDONLY
)) {
2089 ubifs_msg(c
, "cannot re-mount R/O due to prior errors");
2092 ubifs_remount_ro(c
);
2095 if (c
->bulk_read
== 1)
2098 dbg_gen("disable bulk-read");
2103 ubifs_assert(c
->lst
.taken_empty_lebs
> 0);
2108 const struct super_operations ubifs_super_operations
= {
2109 .alloc_inode
= ubifs_alloc_inode
,
2111 .destroy_inode
= ubifs_destroy_inode
,
2112 .put_super
= ubifs_put_super
,
2113 .write_inode
= ubifs_write_inode
,
2114 .evict_inode
= ubifs_evict_inode
,
2115 .statfs
= ubifs_statfs
,
2117 .dirty_inode
= ubifs_dirty_inode
,
2119 .remount_fs
= ubifs_remount_fs
,
2120 .show_options
= ubifs_show_options
,
2121 .sync_fs
= ubifs_sync_fs
,
2126 * open_ubi - parse UBI device name string and open the UBI device.
2127 * @name: UBI volume name
2128 * @mode: UBI volume open mode
2130 * The primary method of mounting UBIFS is by specifying the UBI volume
2131 * character device node path. However, UBIFS may also be mounted withoug any
2132 * character device node using one of the following methods:
2134 * o ubiX_Y - mount UBI device number X, volume Y;
2135 * o ubiY - mount UBI device number 0, volume Y;
2136 * o ubiX:NAME - mount UBI device X, volume with name NAME;
2137 * o ubi:NAME - mount UBI device 0, volume with name NAME.
2139 * Alternative '!' separator may be used instead of ':' (because some shells
2140 * like busybox may interpret ':' as an NFS host name separator). This function
2141 * returns UBI volume description object in case of success and a negative
2142 * error code in case of failure.
2144 static struct ubi_volume_desc
*open_ubi(const char *name
, int mode
)
2147 struct ubi_volume_desc
*ubi
;
2153 /* First, try to open using the device node path method */
2154 ubi
= ubi_open_volume_path(name
, mode
);
2159 /* Try the "nodev" method */
2160 if (name
[0] != 'u' || name
[1] != 'b' || name
[2] != 'i')
2161 return ERR_PTR(-EINVAL
);
2163 /* ubi:NAME method */
2164 if ((name
[3] == ':' || name
[3] == '!') && name
[4] != '\0')
2165 return ubi_open_volume_nm(0, name
+ 4, mode
);
2167 if (!isdigit(name
[3]))
2168 return ERR_PTR(-EINVAL
);
2170 dev
= simple_strtoul(name
+ 3, &endptr
, 0);
2173 if (*endptr
== '\0')
2174 return ubi_open_volume(0, dev
, mode
);
2177 if (*endptr
== '_' && isdigit(endptr
[1])) {
2178 vol
= simple_strtoul(endptr
+ 1, &endptr
, 0);
2179 if (*endptr
!= '\0')
2180 return ERR_PTR(-EINVAL
);
2181 return ubi_open_volume(dev
, vol
, mode
);
2184 /* ubiX:NAME method */
2185 if ((*endptr
== ':' || *endptr
== '!') && endptr
[1] != '\0')
2186 return ubi_open_volume_nm(dev
, ++endptr
, mode
);
2188 return ERR_PTR(-EINVAL
);
2191 static struct ubifs_info
*alloc_ubifs_info(struct ubi_volume_desc
*ubi
)
2193 struct ubifs_info
*c
;
2195 c
= kzalloc(sizeof(struct ubifs_info
), GFP_KERNEL
);
2197 spin_lock_init(&c
->cnt_lock
);
2198 spin_lock_init(&c
->cs_lock
);
2199 spin_lock_init(&c
->buds_lock
);
2200 spin_lock_init(&c
->space_lock
);
2201 spin_lock_init(&c
->orphan_lock
);
2202 init_rwsem(&c
->commit_sem
);
2203 mutex_init(&c
->lp_mutex
);
2204 mutex_init(&c
->tnc_mutex
);
2205 mutex_init(&c
->log_mutex
);
2206 mutex_init(&c
->umount_mutex
);
2207 mutex_init(&c
->bu_mutex
);
2208 mutex_init(&c
->write_reserve_mutex
);
2209 init_waitqueue_head(&c
->cmt_wq
);
2211 c
->old_idx
= RB_ROOT
;
2212 c
->size_tree
= RB_ROOT
;
2213 c
->orph_tree
= RB_ROOT
;
2214 INIT_LIST_HEAD(&c
->infos_list
);
2215 INIT_LIST_HEAD(&c
->idx_gc
);
2216 INIT_LIST_HEAD(&c
->replay_list
);
2217 INIT_LIST_HEAD(&c
->replay_buds
);
2218 INIT_LIST_HEAD(&c
->uncat_list
);
2219 INIT_LIST_HEAD(&c
->empty_list
);
2220 INIT_LIST_HEAD(&c
->freeable_list
);
2221 INIT_LIST_HEAD(&c
->frdi_idx_list
);
2222 INIT_LIST_HEAD(&c
->unclean_leb_list
);
2223 INIT_LIST_HEAD(&c
->old_buds
);
2224 INIT_LIST_HEAD(&c
->orph_list
);
2225 INIT_LIST_HEAD(&c
->orph_new
);
2226 c
->no_chk_data_crc
= 1;
2228 c
->highest_inum
= UBIFS_FIRST_INO
;
2229 c
->lhead_lnum
= c
->ltail_lnum
= UBIFS_LOG_LNUM
;
2231 ubi_get_volume_info(ubi
, &c
->vi
);
2232 ubi_get_device_info(c
->vi
.ubi_num
, &c
->di
);
2237 static int ubifs_fill_super(struct super_block
*sb
, void *data
, int silent
)
2239 struct ubifs_info
*c
= sb
->s_fs_info
;
2245 /* Re-open the UBI device in read-write mode */
2246 c
->ubi
= ubi_open_volume(c
->vi
.ubi_num
, c
->vi
.vol_id
, UBI_READWRITE
);
2248 /* U-Boot read only mode */
2249 c
->ubi
= ubi_open_volume(c
->vi
.ubi_num
, c
->vi
.vol_id
, UBI_READONLY
);
2252 if (IS_ERR(c
->ubi
)) {
2253 err
= PTR_ERR(c
->ubi
);
2259 * UBIFS provides 'backing_dev_info' in order to disable read-ahead. For
2260 * UBIFS, I/O is not deferred, it is done immediately in readpage,
2261 * which means the user would have to wait not just for their own I/O
2262 * but the read-ahead I/O as well i.e. completely pointless.
2264 * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
2266 c
->bdi
.name
= "ubifs",
2267 c
->bdi
.capabilities
= 0;
2268 err
= bdi_init(&c
->bdi
);
2271 err
= bdi_register(&c
->bdi
, NULL
, "ubifs_%d_%d",
2272 c
->vi
.ubi_num
, c
->vi
.vol_id
);
2276 err
= ubifs_parse_options(c
, data
, 0);
2280 sb
->s_bdi
= &c
->bdi
;
2283 sb
->s_magic
= UBIFS_SUPER_MAGIC
;
2284 sb
->s_blocksize
= UBIFS_BLOCK_SIZE
;
2285 sb
->s_blocksize_bits
= UBIFS_BLOCK_SHIFT
;
2286 sb
->s_maxbytes
= c
->max_inode_sz
= key_max_inode_size(c
);
2287 if (c
->max_inode_sz
> MAX_LFS_FILESIZE
)
2288 sb
->s_maxbytes
= c
->max_inode_sz
= MAX_LFS_FILESIZE
;
2289 sb
->s_op
= &ubifs_super_operations
;
2291 sb
->s_xattr
= ubifs_xattr_handlers
;
2294 mutex_lock(&c
->umount_mutex
);
2295 err
= mount_ubifs(c
);
2297 ubifs_assert(err
< 0);
2301 /* Read the root inode */
2302 root
= ubifs_iget(sb
, UBIFS_ROOT_INO
);
2304 err
= PTR_ERR(root
);
2309 sb
->s_root
= d_make_root(root
);
2318 mutex_unlock(&c
->umount_mutex
);
2324 mutex_unlock(&c
->umount_mutex
);
2327 bdi_destroy(&c
->bdi
);
2330 ubi_close_volume(c
->ubi
);
2335 static int sb_test(struct super_block
*sb
, void *data
)
2337 struct ubifs_info
*c1
= data
;
2338 struct ubifs_info
*c
= sb
->s_fs_info
;
2340 return c
->vi
.cdev
== c1
->vi
.cdev
;
2343 static int sb_set(struct super_block
*sb
, void *data
)
2345 sb
->s_fs_info
= data
;
2346 return set_anon_super(sb
, NULL
);
2349 static struct super_block
*alloc_super(struct file_system_type
*type
, int flags
)
2351 struct super_block
*s
;
2354 s
= kzalloc(sizeof(struct super_block
), GFP_USER
);
2357 return ERR_PTR(err
);
2360 INIT_HLIST_NODE(&s
->s_instances
);
2361 INIT_LIST_HEAD(&s
->s_inodes
);
2362 s
->s_time_gran
= 1000000000;
2369 * sget - find or create a superblock
2370 * @type: filesystem type superblock should belong to
2371 * @test: comparison callback
2372 * @set: setup callback
2373 * @flags: mount flags
2374 * @data: argument to each of them
2376 struct super_block
*sget(struct file_system_type
*type
,
2377 int (*test
)(struct super_block
*,void *),
2378 int (*set
)(struct super_block
*,void *),
2382 struct super_block
*s
= NULL
;
2384 struct super_block
*old
;
2390 spin_lock(&sb_lock
);
2392 hlist_for_each_entry(old
, &type
->fs_supers
, s_instances
) {
2393 if (!test(old
, data
))
2395 if (!grab_super(old
))
2398 up_write(&s
->s_umount
);
2407 spin_unlock(&sb_lock
);
2408 s
= alloc_super(type
, flags
);
2410 return ERR_PTR(-ENOMEM
);
2419 spin_unlock(&sb_lock
);
2420 up_write(&s
->s_umount
);
2423 return ERR_PTR(err
);
2427 strlcpy(s
->s_id
, type
->name
, sizeof(s
->s_id
));
2429 strncpy(s
->s_id
, type
->name
, sizeof(s
->s_id
));
2431 list_add_tail(&s
->s_list
, &super_blocks
);
2432 hlist_add_head(&s
->s_instances
, &type
->fs_supers
);
2434 spin_unlock(&sb_lock
);
2435 get_filesystem(type
);
2436 register_shrinker(&s
->s_shrink
);
2441 EXPORT_SYMBOL(sget
);
2444 static struct dentry
*ubifs_mount(struct file_system_type
*fs_type
, int flags
,
2445 const char *name
, void *data
)
2447 struct ubi_volume_desc
*ubi
;
2448 struct ubifs_info
*c
;
2449 struct super_block
*sb
;
2452 dbg_gen("name %s, flags %#x", name
, flags
);
2455 * Get UBI device number and volume ID. Mount it read-only so far
2456 * because this might be a new mount point, and UBI allows only one
2457 * read-write user at a time.
2459 ubi
= open_ubi(name
, UBI_READONLY
);
2461 pr_err("UBIFS error (pid: %d): cannot open \"%s\", error %d",
2462 current
->pid
, name
, (int)PTR_ERR(ubi
));
2463 return ERR_CAST(ubi
);
2466 c
= alloc_ubifs_info(ubi
);
2472 dbg_gen("opened ubi%d_%d", c
->vi
.ubi_num
, c
->vi
.vol_id
);
2474 sb
= sget(fs_type
, sb_test
, sb_set
, flags
, c
);
2482 struct ubifs_info
*c1
= sb
->s_fs_info
;
2484 /* A new mount point for already mounted UBIFS */
2485 dbg_gen("this ubi volume is already mounted");
2486 if (!!(flags
& MS_RDONLY
) != c1
->ro_mount
) {
2491 err
= ubifs_fill_super(sb
, data
, flags
& MS_SILENT
? 1 : 0);
2494 /* We do not support atime */
2495 sb
->s_flags
|= MS_ACTIVE
| MS_NOATIME
;
2498 /* 'fill_super()' opens ubi again so we must close it here */
2499 ubi_close_volume(ubi
);
2505 return dget(sb
->s_root
);
2510 deactivate_locked_super(sb
);
2513 ubi_close_volume(ubi
);
2514 return ERR_PTR(err
);
2517 static void kill_ubifs_super(struct super_block
*s
)
2519 struct ubifs_info
*c
= s
->s_fs_info
;
2526 static struct file_system_type ubifs_fs_type
= {
2528 .owner
= THIS_MODULE
,
2529 .mount
= ubifs_mount
,
2530 .kill_sb
= kill_ubifs_super
,
2533 MODULE_ALIAS_FS("ubifs");
2536 * Inode slab cache constructor.
2538 static void inode_slab_ctor(void *obj
)
2540 struct ubifs_inode
*ui
= obj
;
2541 inode_init_once(&ui
->vfs_inode
);
2544 static int __init
ubifs_init(void)
2546 int ubifs_init(void)
2551 BUILD_BUG_ON(sizeof(struct ubifs_ch
) != 24);
2553 /* Make sure node sizes are 8-byte aligned */
2554 BUILD_BUG_ON(UBIFS_CH_SZ
& 7);
2555 BUILD_BUG_ON(UBIFS_INO_NODE_SZ
& 7);
2556 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ
& 7);
2557 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ
& 7);
2558 BUILD_BUG_ON(UBIFS_DATA_NODE_SZ
& 7);
2559 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ
& 7);
2560 BUILD_BUG_ON(UBIFS_SB_NODE_SZ
& 7);
2561 BUILD_BUG_ON(UBIFS_MST_NODE_SZ
& 7);
2562 BUILD_BUG_ON(UBIFS_REF_NODE_SZ
& 7);
2563 BUILD_BUG_ON(UBIFS_CS_NODE_SZ
& 7);
2564 BUILD_BUG_ON(UBIFS_ORPH_NODE_SZ
& 7);
2566 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ
& 7);
2567 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ
& 7);
2568 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ
& 7);
2569 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ
& 7);
2570 BUILD_BUG_ON(UBIFS_MAX_NODE_SZ
& 7);
2571 BUILD_BUG_ON(MIN_WRITE_SZ
& 7);
2573 /* Check min. node size */
2574 BUILD_BUG_ON(UBIFS_INO_NODE_SZ
< MIN_WRITE_SZ
);
2575 BUILD_BUG_ON(UBIFS_DENT_NODE_SZ
< MIN_WRITE_SZ
);
2576 BUILD_BUG_ON(UBIFS_XENT_NODE_SZ
< MIN_WRITE_SZ
);
2577 BUILD_BUG_ON(UBIFS_TRUN_NODE_SZ
< MIN_WRITE_SZ
);
2579 BUILD_BUG_ON(UBIFS_MAX_DENT_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2580 BUILD_BUG_ON(UBIFS_MAX_XENT_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2581 BUILD_BUG_ON(UBIFS_MAX_DATA_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2582 BUILD_BUG_ON(UBIFS_MAX_INO_NODE_SZ
> UBIFS_MAX_NODE_SZ
);
2584 /* Defined node sizes */
2585 BUILD_BUG_ON(UBIFS_SB_NODE_SZ
!= 4096);
2586 BUILD_BUG_ON(UBIFS_MST_NODE_SZ
!= 512);
2587 BUILD_BUG_ON(UBIFS_INO_NODE_SZ
!= 160);
2588 BUILD_BUG_ON(UBIFS_REF_NODE_SZ
!= 64);
2591 * We use 2 bit wide bit-fields to store compression type, which should
2592 * be amended if more compressors are added. The bit-fields are:
2593 * @compr_type in 'struct ubifs_inode', @default_compr in
2594 * 'struct ubifs_info' and @compr_type in 'struct ubifs_mount_opts'.
2596 BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT
> 4);
2599 * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to
2600 * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2.
2602 if (PAGE_CACHE_SIZE
< UBIFS_BLOCK_SIZE
) {
2603 pr_err("UBIFS error (pid %d): VFS page cache size is %u bytes, but UBIFS requires at least 4096 bytes",
2604 current
->pid
, (unsigned int)PAGE_CACHE_SIZE
);
2609 ubifs_inode_slab
= kmem_cache_create("ubifs_inode_slab",
2610 sizeof(struct ubifs_inode
), 0,
2611 SLAB_MEM_SPREAD
| SLAB_RECLAIM_ACCOUNT
,
2613 if (!ubifs_inode_slab
)
2616 err
= register_shrinker(&ubifs_shrinker_info
);
2621 err
= ubifs_compressors_init();
2626 err
= dbg_debugfs_init();
2630 err
= register_filesystem(&ubifs_fs_type
);
2632 pr_err("UBIFS error (pid %d): cannot register file system, error %d",
2643 ubifs_compressors_exit();
2647 unregister_shrinker(&ubifs_shrinker_info
);
2650 kmem_cache_destroy(ubifs_inode_slab
);
2653 /* late_initcall to let compressors initialize first */
2654 late_initcall(ubifs_init
);
2657 static void __exit
ubifs_exit(void)
2659 ubifs_assert(list_empty(&ubifs_infos
));
2660 ubifs_assert(atomic_long_read(&ubifs_clean_zn_cnt
) == 0);
2663 ubifs_compressors_exit();
2664 unregister_shrinker(&ubifs_shrinker_info
);
2667 * Make sure all delayed rcu free inodes are flushed before we
2671 kmem_cache_destroy(ubifs_inode_slab
);
2672 unregister_filesystem(&ubifs_fs_type
);
2674 module_exit(ubifs_exit
);
2676 MODULE_LICENSE("GPL");
2677 MODULE_VERSION(__stringify(UBIFS_VERSION
));
2678 MODULE_AUTHOR("Artem Bityutskiy, Adrian Hunter");
2679 MODULE_DESCRIPTION("UBIFS - UBI File System");
2681 int uboot_ubifs_mount(char *vol_name
)
2687 * First unmount if allready mounted
2690 ubifs_umount(ubifs_sb
->s_fs_info
);
2693 * Mount in read-only mode
2696 ret
= ubifs_mount(&ubifs_fs_type
, flags
, vol_name
, NULL
);
2698 printf("Error reading superblock on volume '%s' " \
2699 "errno=%d!\n", vol_name
, (int)PTR_ERR(ret
));